Window lock

ABSTRACT

A locking device for a window having double-hung sash movable relative to each other between opened and closed positions and including a plurality of strike plates mounted on one of the sash and a lock unit mounted on the other sash. The lock unit is lockable in an inoperative position and in a plurality of operative positions to releasably retain the sash in closed position or to permit one of the sash to be moved freely relatively to the other sash between closed and partially opened positions.

United States Patent H 13,ss1,533

1,517,447 12/1924 Merz 292/145 2,890,582 6/1959 Navarro 70/364X 3,118,298 l/1964 Holmes 70/100 3,136,147 6/1964 Noster 70/90 Primary ExaminerMarvin A. Champion Assistant Examiner-A1bert G. Craig, Jr. Att0rneyMcCormick, Paulding & Huber ABSTRACT: A locking device for a window having doub1ehung sash movable relative to each other between opened and closed positions and including a plurality of strike plates mounted on one of the sash and a lock unit mounted on the other sash. The lock unit is lockable in an inoperative position and in a plurality of operative positions to releasably retain the sash in closed position or to pennit one of the sash to be moved freely relatively to the other sash between closed and partially opened positions.

PATENTEU JUN 1197! 3.581.533

46 INVliN'lO/Q. a MERTON S. WILLIAMS J D2 Attorneys WINDOW LOCK BACKGROUND OF THE INVENTION the lock unit 26 is in one of its locking positions the tumbler 50, 50 project beyond the cylindrical surface of the plug 34 and into an associated one of the recess 48, 48. The tumblers are adapted for retraction into the plug 34 from their pro- This invention relates in general to locking devices for win- 5 lected position5 3cm)" Ofa P p y 54 inserted in a dows and the like and deals more particularly with an improved locking device for a window ofdouble-hung sash type.

The general aimof the present invention is to provide an improved locking device of the aforedescribed type for locking in a plurality of positions to retain a window in a closed position or to permit the window to be moved freely between closed and partially opened positions.

SUMMARY OF THE INVENTION In accordance with the present invention a window-locking device is provided which includes strike means for mounting on one part of a window and a strike-engaging element for mounting on another part of the window and lockable in a plurality of positions relative to the strike means for selectively locking a window in a closed position or in one or more other positions wherein the window is movable freely between closed and partially opened positions.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary elevational view ofa window having double-hung sash showing a locking device embodying the present invention mounted thereon.

FIG. 2 is a fragmentary sectional view taken along the line 2-2 of FIG. 1.

FIG. 3 is a sectional view through the lock unit taken along the line 3-3 of FIG. 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Turning now to the drawing, a locking device embodying the present invention and indicated generally at is shown mounted on a double-hung window which has upper and lower sash indicated at 12 and 14, respectively, slidable in a frame 16 between open and closed positions. The upper sash has a side rail 18 and a bottom crossrail 20 and the lower sash includes a side rail 22 and a top crossrail 24. The two crossrails are in contactwhen the window is in a closed position as it appears in FIG. 1.

The locking device 10 comprises a lock unit indicated generally at 26 mounted on the upper surface of the crossrail 24 and strike plates 28 and 30 fastened to the side rail 18 which cooperate with the lock unit in various locking positions to lock the window in a closed position or to limit its movement between closed and partially opened positions.

Considering first the lock unit 26, the unit generally comprises a casing 32 supporting a rotary or locking element 34 which carries a locking member 36. The casing may be made in various forms but preferably, and as shown, it includes a barrel portion 38 and a generally rectangular base flange 40 which has a rectilinear edge 42 for parallel alignment with the crossrail 24 to aid in positioning the lock unit on the sash 14. A generally cylindrical bore 44 extends through the barrel portion 38 and has an axis 46 disposed in a plane generally parallel to the plane of the base flange. As viewed from above in FIG. 2, the axis 46 is inclined with respect to the rectilinear edge 42 and the plane of the sash. Recesses 48, 48 extend longitudinally of the bore 44 at the top, bottom and opposite sides thereof, respectively, as shown in FIG. 3.

The locking element used in practicing the invention may be of any type suitable to cooperate with the casing in a plurality of locking positions. In the illustrated embodiment 10 the locking element 34 is a conventional cylindrical key plug of disc tumbler type which has an axially spaced series of disc tumblers mounted in radial slots therein, a typical tumbler being indicated at 50 in FIG. 3. A spring 52 is operatively assoeiated with each tumbler 50 to bias the tumbler toward and to resiliently hold it in a projected position as shown. When slot opening through the forward end of the plug. When the tumblers arc retracted the plug 34 may be rotated in the bore 44 by the key 54.

The strikeengaging member 36 is generally L-shaped and is riveted or otherwise suitably secured at one end to the rear end of the plug 34 and serves to retain the plug in assembly with the casing 32. The terminal or free end portion of the member 36 is spaced radially outwardly from the axis 46 and bent rearwardly. It has an arcuately formed radially outwardly facing strike engaging surface 56 and abutment surface 58 and 60 on opposite sides thereof arranged to engage the upper surface of the base flange 40 which limits rotation of the plug 34 in both a clockwise and a counterclockwise direction.

The number of locking positions may vary. The illustrated device 10 has three locking positions which include an inoperative position and two operative ones. In FIG. 1, the member 36 is shown in 12 o'clock position corresponding to a fully locked position of the window. The disc tumblers 50, 50 are aligned with recesses 48, 48 at the top and bottom of the bore 44 and biased downwardly into the recess 48 at the bottom of the bore when the key 54 is withdrawn from the plug to retain the lock unit 26 in the latter position. Rotation of the key 54 in a counterclockwise direction from the fully locked position moves the member 36 to a nine Oclock or inoperative position. The abutment surface 58 engages the flange 40 to arrest counterclockwise rotation of the plug when the tumblers 50, 50 are generally aligned with the recess 48, 48 at the sides of the bore so that the key 54 may be withdrawn to lock the member in its nine oclock position. Rotation of the key in a clockwise direction through an angle of from the inoperative position moves the member 36 to another operating position at three oclock corresponding to another locked condition of the window. Clockwise rotation of the plug 34 is arrested by engagement of the abutment surface 60 with the base flange 40 as best shown in FIG. 3. The key may also be withdrawn from the plug to lock the unit 26 when the locking member 36 is in its three oclock position.

The strike plates 28 and 30 are fastened to the side rail 18 in vertically spaced relation to each other and to the crossrail 20 and preferably extend for some distance inwardly from the rail or toward the center of the window. The lower strike plate has a downwardly facing abutment surface 62 for engaging the arcuate surface 56 on the member 36 when the window is in its closed position and the lock unit is in its fully locked position. The upper strike plate 30 extends inwardly for some distance beyond the lower strike plate 28 and has a downwardly facing abutment surface 64 for engaging the side abutment surface 58 when the member 36 is in its three o'clock position. In the latter position the terminal end portion of the member 36 is disposed transversely inwardly of the inner edge of the lower strike plate 28 so that the member 36 is free to move past the strike plate 28 as the window is moved toward its open position. The inwardly extending free end portion of the upper strike plate 30 is disposed in the path of the element 36 so that the abutment surface 58 ultimately engages the strikeengaging surface 64 to limit the movement of the window toward its fully open position. Thus, when the element 36 is locked in its three oclock position the sash 12 and] 14 are freely movable between their closed position and partially open positions. When the element 36 is in its inoperative position, the terminal end of the element is spaced forwardly of the strike plates 28 and 30 and the sash l2 and 14 are freely movable between their closed and fully opened positions lclaim:

l. A locking device for a window having double'hung sash longitudinally movable relative to each other through a range of positions between opened and closed positions, said device comprising strike means adapted for mounting in fixed position on one of the sash for movement therewith to provide a plurality of spaced-apart fixed strike surfaces, and a lock unit adapted for mounting on the other sash and having a strike-engaging member and means for moving said member to and locking said member in a plurality of locking positions relative to said strike means, said locking positions including a first operative position wherein said member is engageable with one of said strike surfaces and said sash are releasably retained in the closed position, a second operative position wherein said member is freely movable with said other sash and relative to said one'strike surface and engageable with another of said strike surfaces and the sash are freely movable between the closed position'and partially opened positions and an inoperative position wherein said member is freely movable with said other sash and relative to said one and said other strike surface and said sash are freely movable between the closed and the open position.

2. A locking device as set forth in claim 1 wherein said member is rotatable about a horizontal axis to said locking positions.

3. A locking device as set forth in claim 2 wherein said strike-engaging member is generally L-shaped and includes a radially outwardly'spaced strike-engaging portion extending in a generally axial direction.

4. A locking device as set forth in claim 2 wherein said lock unit includes a base for mounting said unit on said other sash, said base having a generally rectilinear edge inclined to said axis for parallel alignment with an associated sash rail.

5. A locking device as set forth in claim 2 wherein said axis is inclined to the plane of the sash.

6. A locking device as set forth in claim 1 wherein said strike means comprises first and second strike plates, said first plate defining said one strike surface and said second plate defining said other strike surface.

7. A locking device as set forth in claim 6 wherein said one strike surface is transversely spaced from said other strike surface.

8. A locking device as set forth in claim 7 wherein said strike-engaging member is rotatable about a horizontal axis to said locking positions.

9. A locking device as set forth in claim 8 wherein said axis is inclined to the plane of the sash.

10. A locking device as set forth in claim 6 wherein said second plate has a transverse dimension greater than the transverse dimension of said first plate.

11. A locking device as set forth in claim 1 wherein said one strike surface is longitudinally spaced from said other strike surface.

12 A locking device as set forth in claim 1 wherein said one strike surface is transversely spaced from said other strike surface.

13. A locking device as set forth in claim 1 wherein said one strike surface is both longitudinally and transversely spaced from said other strike surface.

14. A locking device as set forth in claim 1 wherein said means for moving said member comprises a rotatable key plug and a removable key.

15. A locking device as set forth in claim 1 including stop means for limiting the movement of said member to a plurality of said locking positions. 

1. A locking device for a window having double-hung sash longitudinally movable relative to each other through a range of positions between opened and closed positions, said device comprising strike means adapted for mounting in fixed position on one of the sash for movement therewith to provide a plurality of spaced-apart fixed strike surfaces, and a lock unit adapted for mounting on the other sash and having a strike-engaging member and means for moving said member to and locking said member in a plurality of locking positions relative to said strike means, said locking positions including a first operative position wherein said member is engageable with one of said strike surfaces and said sash are releasably retained in the closed position, a second operative position wherein said member is freely movable with said other sash and relative to said one strike surface and engageable with another of said strike surfaces and the sash are freely movable between the closed position and partially opened positions and an inoperative position wherein said member is freely movable with said other sash and relative to said one and said other strike surface and said sash are freely movable between the closed and the open position.
 2. A locking device as set forth in claim 1 wherein said member is rotatable about a horizontal axis to said locking positions.
 3. A locking device as set forth in claim 2 wherein said strike-engaging member is generally L-shaped and includes a radially outwardly spaced strike-engaging portion extending in a generally axial direction.
 4. A locking device as set forth in claim 2 wherein said lock unit includes a base for mounting said unit on said other sash, said base having a generally rectilinear edge inclined to said axis for parallel alignment with an associated sash rail.
 5. A locking device as set forth in claim 2 wherein said axis is inclined to the plane of the sash.
 6. A locking device as set forth in claim 1 wherein said strike means comprises first and second strike plates, said first plate defining said one strike surface and said second plate defining said other strike surface.
 7. A locking device as set forth in claim 6 wherein said one strike surface is transversely spaced from said other strike surface.
 8. A locking device as set forth in claim 7 wherein said strike-engaging member is rotatable about a horizontal axis to said locking positions.
 9. A locking device as set forth in claim 8 wherein said axis is inclined to the plane of the sash.
 10. A locking device as set forth in claim 6 wherein said second plate has a transverse dimension greater than the transverse dimension of said first plate.
 11. A locking device as set forth in claim 1 wherein said one strike surface is longitudinally spaced from said other strike surface. 12 A locking device as set forth in claim 1 wherein said one strike surface is transversely spaced from said other strike surface.
 13. A locking device as set forth in claim 1 wherein said one strike surface is both longitudinally and transversely spaced from said other strike surface.
 14. A Locking device as set forth in claim 1 wherein said means for moving said member comprises a rotatable key plug and a removable key.
 15. A locking device as set forth in claim 1 including stop means for limiting the movement of said member to a plurality of said locking positions. 